Assertion`:-` Members of Rhodophyceae are called red algae
Reason`:-` Red algae posses, predominance of `r-`phycoerythrin in their body.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False

Explanation

To solve the question, we need to evaluate both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states: "Members of Rhodophyceae are called red algae."
- This statement is true. Rhodophyceae is a class of algae commonly known as red algae due to their characteristic red color.

**Hint:** Remember that the classification of algae is often based on their pigmentation.

### Step 2: Analyze the Reason
The reason states: "Red algae possess predominance of r-phycoerythrin in their body."
- This statement is also true. Red algae have a high concentration of r-phycoerythrin, which is a red pigment that gives them their distinctive color.

**Hint:** Consider how pigments influence the color of organisms and their classification.

### Step 3: Determine the Relationship
Now, we need to determine if the reason correctly explains the assertion.
- The reason explains why members of Rhodophyceae are called red algae: it is due to the predominance of r-phycoerythrin.

**Hint:** Think about whether the reason provides a logical explanation for the assertion.

### Conclusion
Both the assertion and the reason are true, and the reason is the correct explanation for the assertion. Therefore, the answer is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

**Final Answer:** Both assertion and reason are true, and reason is the correct explanation of the assertion.